We ended up staying at Terachai's place 3 times on our most recent trip to Asia. It's in the perfect location if you're looking to stay in downtown Bangkok. Really close to public transportation (BTS and MRT). A block away from Terminal 21, street vendors and plenty of restaurants.
The place is very clean, cozy and it's a great price for the area. Terachai was very easy to communicate with and always quick to respond. I'd definitely stay here again.